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Aging mechanism of wood-plastic composite was: light and heat break down the long molecular chains of wood flour and plastic; the free radicals reacted with the oxygen, which generated carbonyl groups, hydroperoxides and so on; the free radicals also had cross linking reaction, which generated alkoxy; Water destroyed the interface of wood flour and plastic, hydrolyzed ester additives, extracted the small molecule additives and degradation products; Microorganism degraded cellulose, semicellulose, lignin and ester additives; degradation product from different component accelerated the aging, which could be exampled by the fact that HCl from degradation of PVC accelerated the hydrolyzation of cellulose and semicellulose.

木塑复合材料的老化机理为：光和热引发木塑复合材料中木质组分和塑料组分大分子链断裂，产生的自由基与氧气作用，发生链支化反应生成羰基、氢过氧化物等，发生交联反应生成烷氧基等；水分破坏木-塑界面、水解酯类添加剂、抽提小分子添加剂和降解产物；微生物分解纤维素、半纤维素、木素和酯类添加剂；木塑复合材料中各组分的降解产物相互促进老化，PVC降解产生的HCl溶于水，促进了纤维素和半纤维素的水解。

Pastijn left the question open whether is a congruence on the free idempotent semiring generated by two free generators. In this paper, the open question will be solved.

从而，提出了一个公开问题：是否为由两个自由生成元生成的幂等元半环上的同余，本文给出了这个问题的一个肯定的回答。

Capsule septicidal, seeds usually unwinged, or with keel or small; stamens free, or fascicles with filaments free nearly to base, or if up to 2/3 united, then stamens 3

通常种子，蒴果室间开裂，小的龙骨状的或具或；如果可达2/3的合生，雄蕊离生，或束簇具花丝离生近基部，或，然后雄蕊3 5

In that shoreless ocean, at thy silently listening smile my songs would swell in melodies, free as waves, free from all bondage of words.

在无边的海洋上，在你静听的微笑中，我的歌唱抑扬成调，像海波一般的自由，不

In that shoreless ocean, at thy silently listening smile my songs would swell in melodies, free as waves, free from all bondage of words.

在无边的海洋上，在你静听的微笑中，我的歌唱抑扬成调，像海波一般的自由，不受字句的束缚。

In that shoreless ocean, at thy silently listening smile my songs would swell in melodies, free as waves, free from all bondage of words.

在无边的海洋上，在你静听的微笑中，我的歌唱抑扬成调，象海波一般的自由，不受字句的束缚。

In that shoreless ocean, at thy silently listening smile my songs would swell in melodies, free as waves, free from all bondage of words.

在那无边大海上，在你静听的笑容中，我的歌儿旋律高昂，犹如海浪般地自由，摆脱一切文字的束缚。

By making theoretical analysis on vibration characteristics of a single slab and multi ones set in the inverted arch ring, four processes about stability failure, that is free vibration, locking, sleeking and distortion are proposed on the condition that water sealing was damaged and anchor-hold was out of action, a formula of the slab's maximum free displacement and dynamic equations in each process are obtained.

对反拱水垫塘单底板块和多底板块振动特性进行了理论分析，提出了拱圈底板块失稳分为自由振动、锁定、滑动变形及拱圈失稳四个过程，给出了各振动过程的动力学方程以及底板块自由振动的最大理论高度的计算公式。

This is how the star spangled banner was meant to be flown on the end of a pole of its own, free to wave majestically in our own free air.

美国国旗应当挂在旗杆上，自由自在地在美国领土的上空美丽庄严地飘扬。您觉得最佳答案好不好？目前有0人评价

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。